The interior angles of a polygon are in A.P. the smallest angle is `120^@` and the common difference is `5^@dot` Find the number of sides of the polygon.

Explanation

To solve the problem of finding the number of sides of a polygon whose interior angles are in Arithmetic Progression (A.P.), we follow these steps:

### Step 1: Understand the properties of the polygon
The sum of the interior angles of a polygon with \( n \) sides is given by the formula:
\[ \text{Sum of interior angles} = (n - 2) \times 180^\circ \]

...